Printing telegraphy



G. A. GRAHAM PRINTING TELEGRPHY Filed March 23. 1929 'Aug 25, 1931. 1,820,737

2 Sheets-Shoal?I l y @Mw Ww Aug. 25, 1931. G. A. GRAHAM PRINTING TELEGRA-PHY Filed March 23. 1929 2 Sheets-Sheet 2 I' Patented Aug; 25, l

UNITEDV STATES PATENT OFFICE GEORGE. A. GRAHAM, or WASHINGTON, Drs'rnicr 0E coLUiiIEIA. y

PRINTING 'rELEGismrEi'YN Appncation mea March 23, ti929. serial No-349,399.

(GRANTED uNDEaTEE- Aer or MARCHl s, lass, As AMENDED APRIL ao, `192fx 37o o. G. 757) The invention kdescribed herein may be manufactured and usedby or for-the Government for governmental purposes, without the payment to meofany royalty thereon.'

This invention relatesto the control oveg1 a single grounded line or metallic circuit of two or more printing telegraph instruments or stations, or any other device.

One of the main objects of this invention is to provide a means of control over a single grounded line of two or more, sending-receiving printing telegraph instruments located at distances apart. s

Another main object of this invention is the provision of a means of controlover a single grounded line of two or more sending-receiving printing Atelegraph instruments located at distances apart in such a manner that-all instruments or stations may be started or stopped from any one of the instruments or stations independent of anyl manual action or attendance at any other station.

That designating two stations as A and B, A A and B may be started if at rest from either A or B and if running may be stopped from either A or B irrespective of wherestarted. Furthermore that this means of control is entirely automatic such that in starting both A and B instruments from .AA no attendant is required atl/B to perform any rfunction whatever, and vice versa.

Another important object of this invention is the provision of a means of control over a single grounded line of two or more sendingreceiving printing telegraph instruments or stations upon the open circuit principle. A

The benefits of the .open circuit principle are well known to those skilled in the art inasmueh as at rest no battery is presentedto. lineand hence the economies thereof. n

Another main object of this invention is to. provideall the features enumerated above in using as conductors between `stations a pair of wires in open1 ine or cable, or simplex, -or composite circuits for it will be seen that this control may employ any of these vcircuits equally well. l

The accompanying drawings illustrate the circuit arrangements of this means'of control in conjunction with the circuits of two sending-receiving printing telegraph instruments or'stations of well known make, presumably located at distances apart.

Fig. l, is the method teries at each station.

of using two line batig. 2, is the method of using one line battery with center tap at each station.

Referring now to these drawings and parlarly to Fig. 1, two sending-receiving f i printing telegraph stations are shown diagrammatically, one in the inclosure Adesig natedA and one in the inclosure designated ticu 1s represented in those circuits and apparatus within the sub-inclosure D. The operation of theprmting telegraph instrument iswell kno Wn in the art and will not be described in detail herein except only insofar as is neces- Sary to make the operation of the control methodslunder this invention clear.

The Ninstrument in sub-inclosure C at staand ` nit, driving motor, and starting stopplng devices. The keyboard transnorma'llylclo'sed being the so called start and stop contact. rlhe other contacts 7, 8, 9, 10

11 are'signalling contacts operating in' accordance with the B'audot code in `this instance, as controlled byfthe. keyboard and' driving motor.

The printer unit selecting magnet, or magnets, which is the receiving 3 element, is shown at' 44' controlled by the 'B connected together by the single line wire,

tionA consists of a keyboardrtransmitter, a pr1nting signals thru the line relay 39 by means of the local circuit bat'tery50,- wire 46, magnet 44,

wire 47, fuse 48, wire 49, armature 41, :front contact and wire 67. The line relay 39 is the usual line vrelay and selected according to the line and battery used. A polarized rela are For tlie y 33 is shown, the windings of which in the line circuit, to be described ylater. proper functioning in conjunction with control methods claimed by me it is to be' the current iiow is broken or not. Recipro-y cally upon a current flowing thru the relay windings from terminal 69 to terminal 68 armature 31 moves over to contact 32. It

will be then seen that the position of-thearmature 31 determines whether the local circuit, battery 28, wire 29, armature 31, contact 30,y wire 51, relay winding 34, wire 68, and wire 27, is open or closed. And if closed `relay 34 is energized which closes contacts 35 and 36. Now the closing of these contacts 35 and 36 starts the driving motor of the instru ent by a conventional circuit not shown, and if closed and the motor running the opening of these contacts 35 and 36 stops the motor.

Now at station B the instrument in subinclosure D is identical in all respects with that just described at station A, sub-inclosure C. It will then be seen that we have two sending-receiving printing telegraph instruments connected by the single line, 1, in the conventional manner from terminal 69, Wire 16, break key- 15, contact 14, wire`13, polarized relay T33, 4wire 12, transmitting contacts 11, 10, 9, 8, 7, 6, 5, wire`4, fuse 3, wire 2, line relay 39, line 1, line relay 7 3, Wire 74, break key 75, contact 76, Wire 77, polarized relay 80, wire 81, transmitting contacts 82, 83, 84, 85, 86, 87, and 87 (a), wire 88, fuse 89, and terminal 7 2, Now the method of continuing this circuit from terminal 69, at station A, to battery and ground, with the insertion of certain interacting devices to perform a given function, and the method of completion thereof from terminal 72, at station B, to battery and ground, with the insertion of certain interacting devices to perform a given function constitutes the method of control claimed by me.

At station A,`91 is a telephone switchboard cam lever key, non-locking in both positions, with cam 60 and spring combinations shown in normal position. Any type of switching device designed for various voltages' and properly arranged to functionin the same manner as shown may be substituted for this key. 55 and 65 are batteries poled and connected to ground as shown, 52 is a relay of any type desired that moves an armature 23 from a back contact 22, to a front contact 24 upon the relay winding being energized and returns the armature 23 from the front contact 24 to the back contact 22 upon the relay windings being (ie-energized. The windings of relay 52 are connected in parallel with the windings of the motor starting relay 34 with respect to battery 28,by wire 25 and 26 Bothrelays 34 and 52 are operated by the armature 31` and Contact 30 of the polarized relay 33.

At station B an identical arrangement is made, 92 is' the non-locking telephone key, with cam 96 and spring combinations shown in normal position. As for station A any type of switching 4device designed for any voltage and properly arranged to function in the 'same manner as shown, may be substituted for this key. 94 and 95 are batteries poled and connected to ground as shown. 93 is the relay with operating characteristics identical to relay 52 of station A and so connected. The motor starting relay 123 and lrelay 93 are alsooperated by .the armature 121 and contact 120 of the polarized relay 80 being in parallel oil1 of circuit shown by wi re 117, battery 118, Wire 119, armature 121, contact 120,' and wire-128.

vIt is believed that the character of the equipment has been sufliciently described to now consider its operation.. With both instruments C and D at rest and keys 91 and 92 normal the line circuit is grounded at both ends, as is peculiar to fopen circuit practice, each instrument is in a position to receive a signal from the other station. The circuit is, starting at ground 143 of station A, wire 20, contact 22,armature 23, Wire 19, key spring 59, key spring 58, wire 18, key spring 63,key spring 62, wire 17, wire 16, break key 15, wire 13, polarized relay 33, wire 12, transmitting contacts 6 and, wire 4, fuse 3, wire 2, line relay 39, line wire l, line relay 73, Wire 74, break key 75, wire 77, poralized relay 80, wire 81, transmitting contacts 87 and 87(a), Wire 88, fuse 89, wire 90, key spring 98, key spring. 99, 'Wire 103, key spring 101,

key spring 102, wire 109, armature 113, rear contact 112, wire 110, to ground 146. It will be observed that there is no battery t0 line in rest position. Let us suppose it is desired to start from station A,"`the operator at A moves the cam 60 of key 91 to the.. left, the circuit is then from ground144, wire 56, battery 55 presenting positive to line, wire 54, key spring 57, key spring` 58, wire 18, key spring 63, key spring 62, wire 17, wire 16, break key 15, contact 14, wire 13, polarized relay 33, wire 12, transmitting contacts 6 and 5, wire 4, fuse' 3, Wire 2, line relay 39,

line wire 1, line relay 73, wire 74, break key where it stays as long as the current is iny this direction or if the circuit is subsequently opened. The polarized relay80 acts in the f I and moves its armature'121 over tocontact 120 where it stays', current in this direction Lor no current. Polarized relay 33 has thereby closed the local'C `circuits vfrom battery 28, wire 29, armature 31, contact 30, Wire 5 1, relay 34, windings Wire 68, wire 27, and like wise the parallel circuit of wire 26, relay windings 52 and Wire 25. Relay 34 is thereby energized closing its contacts 35 and 36 .y and so starting the driving motor of instrument C.' Relay 52 is also energized and moves armature y23 over to Contact 24.. This action provides a circuit from ground 144, wire'56, battery 55, wire 54, Wire 53, Contact 24, armature 23, Wire 19, key spring 59, in preparation for the operator releasing the key 91 to returnto normal in which instance it will be seen that therelay locksup a circuit about the key upon the keysrestoration. The operator accordingly releases thekey which returns lto normal and instrument C is in operative condition. Also as noted before the polarized relay 80 has moved' its armature 121 over to contact 120 and relay 123 is energizedby. pircuit from battery 118, wire 119, armature 12,1, contact 120,- Wire 128, relay winding 123, wire 125,- wire 117 likewise relay 93 is energized in the parallel circuit -formed by Wire 115, relay winding 93, and wire 116. IRelay 123 closes its contacts 124 and 142, thus operating the driving motor of instrument D and relay 93 moves its armature 113 overto contact 114 thereby alsolocki'n`g up a circuit about key 92 which connects the tery 55 at A station is now in series aiding in the line circuit with battery 95 at B station. The line circuit in its entirety isthen; ground 144, wire 56, battery 55,\wire 54, wire'53, conspring 62, wire 17', wire 16, break'key 15, wire 13,fpolariz ed relay winding 33, wire 12, transmitting contacts 6 and 5, wire'4, fuse'3, w1re 2, line relay windings 39, line wire 1, line relay windings 73, Wirev74, break key 75, w1re 77, polarized relay windings 80, wire 81, transmitted contacts 87 and 87 (a), wire 88, fuse 89, wire 90, key spring 98, key spring 99, wire 103, key spring 101, key spring 102, wire 109, armature 113, contact 114, wire 108, wire 104, battery 95, wire 105, tov ground 147. The instrument C at s tationA and the instrument D at station 'B have' their motors runningA and may be operated at will from either station by the usual'mcthod of keyboard operation oi the'transmitti-ng contacts .or tape operation of these contacts. The making and breaking of the signaling vcontacts of the transmitters do not affect the polarized relays but'do affect the two line relays 39 and 73 which in turn operate the printerselecting vmagnets 44 and 130 respectively. These local circuits are for relay 39, from battery 50, wire line-circuit to battery 95 and ground. Battact 24,l armature 23, wire 19, key spring 59,y key-spring 58, wire 18, lkey spring 63, key..

wire 47, printer -selecting magnet 44, wire 46,' 73,from batteryl return to battery; for relay 4 136, wire135`, fuse 133, wire 131, printer selecting magnet y130, wire l132, `Wire 134, conf tact 139, armature 138, wire 141, return to battery. Both instruments have'accordingly been started from A and are operative at either A or B 'andA the starting thereof has not in any Way required the assistance of an operator at B. Similarly byexactly the same process o f moving his key to the left an4 operator at B could, have'star'ted up Aa and B `Without any assistance from A.'

With bothj-nstruinents running and operative they may now be stopped fromeither station without requiring any act at the distant station, bythe movement -of 'cam 60 of key'91 at station A to the right or by thel 8'5 movement of `cam 96 of key 92 to the right at station B. In either casel the result is the same, and is to present battery of opposite polarity to that used for startingand transmittingV to-line, and hence -current in theopposite direction thru the -polarized relays 33 and 123 which moves the armatures to thev open position. `-It :must be understood that .battery 65 at station A and 'battery 94 at station B are lfof a higher voltage .than battery at station A andgof battery 95 at station .B. The amount of difference allowed for by properV adjustment of the polarized relay. It has been vfound by experiment that a very satisfactory arrangement is to have battery '150,

twice'the voltage of battery 55 at A and battery 94 twice the voltage of battery 95 at B it being realized that the stopping bat# teries 65 and 94 areonly in circuit for a brief instant. AAssuming that itis desired to stop 1,05 Y

both instruments from station A the operator moves the cam. 60 of key 91 to the right n position and then releases it to normal being non-locking. In this interval negative battery 65 is presentedto. line and positive battery -55 is removed from line at key spring 63. The circuit is from ground 145, wire 66, battery 65, wire 64, key spring 61, key spring 62,

wire 17, wire 16, break key 15wire 13, polarl ized .relay winding 33, wire 12', transmittm fllo contacts 6 and 5, Wire`4, fuse 3, Wire 2. line relay windings 39, wire 1, line relay windings 73, wire 74, break key 75, Wire 77, polarized relay windings 80, wire 81, transmitting lcoutacts 87 and 87 (a) Wire 88, fuse 89, wire 90,

key spring 98, key spring 99, wire 103, key' spring 101, key spring 102, wire 109, armature i 113, contact 114, (relay 93 beingenergized), Wire 108, Wire 104, battery 95,'wi-re 105, to

ground 147. .Accordingly the armature 31 of` polarized relay 33 moves from'contact 30 over'to contact 32 which de-energizes relay 34 which in turnopen's ycontacts 35 and. 36 thereby .stopping the A station motor. .Relay 52 is also de-energizedreturning to normal under action of spring 21. Likevvise armature 121 of polarized relay 80 moves from contact 120 over to contact 122 which fle-energizes relay 123 thereby stopping B station motor. Relay 5 93 is also (le-energized returning to normal.

N ow upon the operator at A releasing his key,

all circuits thruout are, restored to rest or normal position. Whereas we considered that A station performed the operation of stopping both stations, the same effect would have been produced if We had moved cam 96 of key 92 at station B to the right only in this case battery 94 at B station Would have been put in series opposing with battery 55 at A rlrstation and it being borne in mind that battery 94 is of greater voltage than battery 55.

The. method using one line battery With center tap at each station will be understood by an examination of Fig. 2, in which the inclosure AH is one station and the inclosure B is another station connected together by the single line wire 1. All equipment is identical as described previously for Fig. 1, except in the key spring combinations of keys 155 and :15 156, the arrangement thereof, and the manner of wiring from the keys to battery and ground.`

Assume that We ydesire to start both machines from station A, the operator moves cani 33 57 of key 155 to the left and the starting circuit is from ground 152, wire 68, key spring 66, key spring 65, Wire 71, battery 72 (positive to line negative to ground), wire 69, key spring`62, key spring 63, wire 61, key spring 37 54, key spring 55 (being operated), wire 18,

key spring 60, key spring 59, Wire 17 and 16. break key 15, contact 14, Wire 13, polarized relay 33, Wire 12, transmitter start-stop contact 6, common contact 5, Wire 4, fuse 3, Wire 4o 2, line relay 39, line Wire 1, line relay 76, Wire 53 circuit.

77, break key 79, contact 80, Wire 81, polarized'relay '82, Wire 83, start-stop contact 89, common Contact 90, wire 91, fuse 92, Wire 94, key spring 96, key spring 97, Wire 101, key

` spring 99, key spring 100, Wire 118, armature 23 'over to front contact 24 providing a eircuit, wire 19 and 53, around the key as a lock so that when the 'key is released continuity is o preserved. Also at station -B polarized relay 82 has moved its armature 132 over to contact 131 Which similarly operates relays 134 and 119. As at station A, relay 134 starts the motor of machine D and relay 119 moves its armature 121 over to contact 122. This 107, keyspring 108Wire 110, to ground 154.

Both machines C and l) are now operative and function as determined by the line signaling impulses set up by the transmitting conmais 5, 6, 7, 8, 9, 1o and 11 at C or 84., 85, 86,

87, 88, 89 and 90 at D as the case may'be. The i transmitting contacts are keyboard or tape operated as iswell known in the art. Polarized relays 33 and 82 stay in the operative position Whether there is current onthe line or not by definition.

To stop from let us say station. A, key 155 is operated by moving cam 57 to the right. The circuit then is starting at ground '152, wire 68, key spring 66, key spring 67, Wire 74, battery 73 (with positive to ground), battery 72 (series with 73), yWire 7l, strap to key spring 64, Wire 7 0,-key spring 58, key spring 59, Wire 17, Wire 16, break key 15, Contact 14, wire 13, polarized relay 33, Wire 12, transmitting start-stop contacts 6 and 5, Wire 4, fuse 3, wire 2, line-relay 39, line l, line relay 76, Wire 77, break key 79, contact 80, Wire 81, polarized relay 82 wire 83, transmitting start-stop contacts 89 and.90, Wire 91, fuse p 92, wire 94, key spring 96, key spring 97,

wire 101, key spring v99, key spring 100, Wire 118, armature 121, front contact 122, wire 117, Wire 102, key spring 105, key spring' 104, Wire 115, battery 113, wire 112, key

spring 107, key spring 108, Wire 110, ground 154. yIn this circuit batteries 72 and 73 are put in series with each other with positive to ground and negative to line, and battery 113` is in opposition thereto having positive to ground and negative to line. But battery 72 and 113 are equal in voltages and neutralize each other so the additional voltage of battery 73 causes a current to flow over the line and thru the polarized relays in a reverse direction to that used for starting. Accordingly polarizedrelay 33 moves its'ar-maturc over to contact 32 and polarized relay 82 moves its armature over to contact 133.

Relays 34, 52, 134 yand 119 are thereby de-v each station so that the charge may leak olf4 v upon releasing the stop key, and notstartr the machines up again by condenser discharge thru the polarized relays to ground.

I claim:

Il. A printing-telegraph system, comprising a plurality of sending-receiving stations; a single line circuit interconnecting said stations and'normally open when at rest; control means in said circuit for starting and stopping any one station; and means operable through said line interconnecting circuit and responsive to said control means for starting and-stopping other stations in'the system.

2. A printing-telegraph system, comprising a plurality of sending-receiving stations located at distances apart; a single grounded line circuit interconnecting.,r said stations, said circuit being normally open at rest peri- 20 ods and including a single grounded control circuit for each station operable through said line circuit; and means in the control circuit of one station for automatically starting and stopping otherstations in the system.

3. A printing-'telegraph system, comprising a plurality of sending-receiving stations; a single line circiit interconnecting said stations, and including a control circuit for each station and operable independently thereof through said interconnecting circuit, each circuit being in open circuit condition when at rest. y

4. A printing-telegraphsystem, comprising a plurality of sending-receiving stations; a singleline circuit interconnecting said stationssaid current being normally open at rest periods and including a'normally openl control circuit for each station and operable` through the interconnecting circuit, said control circuit including a starting component and a stopping component; and start-stop means at any one station operable selectively with either component through the interconnecting circuit to eect starting and stoptem. Y

5. A printing-telegraph system, comprising a plurality of sending-recelving statlons;

a single/line circuit interconnectlng said statrol circuitl for each station. and operable through the interconnecting circuit, said control circuit including av starting component and a stopping component;`a current source for` each of said components, vthe current ing a plurality of sending-receiving"stations;

printing telegraph ping operations at other stations in the systions, said circuit'being normally open at rest Y periods and including a normally open cona single line circuit interconnecting said stations, and including a control circuit for each. station, the complete circuit being normally open when at rest; a switch key' inthe control circuit and means in said control circuit operative upon'release of said switch key to lock-up a circuit whereby any selected station in the system is placed in condition for operation.

7 A printing-telegraph system, comprisa sing'le line circuit interconnecting said stations, said circuit being normally open when at restga switch key' at a sending station for starting other` stations through the line circuit; and means in said line circuit operative When said key is released ,from station starting position to lock up a portion .of said line circuit whereby lany selected stationjn the system is placed in readiness for operation.

8. A printing-telegraph system, comprising a plurality. of sending receiving stations; a single line circuit interconnecting said ystations and normally open when at rest; control means at a lsending station for starting other stations through the line circuit; and -means operable with said sending station and, through said line circuit for transmitting impulses to other stations in the system. i l l a In testimony whereof I aix my signature. GEORGE A, (JrRAIJIA-M.`

ing a plurality or' sending-receiving stations;

cub 

